Question

Explain why Naphthalene ball disappear with time without leaving
any solid?

or

A bird cannot fly in vacuum. Explain why​

Answer 1

Answer:

1. Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.
2. A: Birds generate lift by using Bernoulli's principle just like an airplane. ... Without air, like in a vacuum, it is not possible to generate low and high pressure around a wing and so the bird cannot achieve lift.

Answer 2

Explanation:

1.) Naphthalene undergoes sublimation easily i.e., the change of state of naphthalene from solid to gas without the intervention of the liquid state. Thus, naphthalene balls keep on forming naphthalene vapours which disappear into the air with time without leaving any solid.

or

2.)Birds generate lift by using Bernoulli's principle just like an airplane. ... Without air, like in a vacuum, it is not possible to generate low and high pressure around a wing and so the bird cannot achieve lift

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